Rail grinder



DC 12, 1944- H.'H. TALBYS Erm. 2,364,879

RAL'GRINDER Filed Jan. '7. 1942 8 Sheets-Sheet l De- 12,1944 H. H. TALBoYs ETAL. 2,364,879

RAIL GRINDER Filed Jan. 7, 1942 8 Sheets-Sheet 2 il 4| lllln Dec 12, 1944- H. H. TALBOYS ETAL 2,364,8L79

RAIL GRINDER Filed Jan. 7, 1942 a sheets-sheet 4 Dec. 12, 1944- H. H. TALBoYs Erm.

RAIL. GRINDER Filed Jan. 7. 1942 8 Sheets-Sheet 5 ,Q @NN llllll DSG 12, 1944- H. H. TALBoYs ErAL 2,364,879

' RAIL GRINDER Filed Jan. 7, 1942 s sheets-sheet 7' Dec l2, 1944 H. H. TALBoYs ETAL. l 2,364,879

RAIL GRINDER Filed Jan. 7, 1942 a sheets-sheet a Fey/6 Patented Dec. 12, 19.44

RAIL GRINDER Henry H. Talboys and Helmer E. Erickson, Milwaukee, Wis., assignors to Nordberg Manufacturing Co., Milwaukee, Wis.. -a corporationof Wisconsin Application January 7, 1942, serial No. 425,845'

28 Claims.

This invention relates to an improvement in track grinders and has for one purpose the provision of a track or rail grinder which is compact, eicient and easily operated.

Another purpose is the provision of improved means for adjusting the grinding tool in relation tothe supporting frame4 riding upon the rails of a track.

Another purpose is the provision of improved means for varying or controlling the angle of the grinding tool in relation to either rail of a track.

Another purpose is the provision of improved drive means for the grinding tool.

Another purpose is the provision of improved means for movably mounting the grinding tool in relation to the power plant and power plant means for permitting movement oradjustment' of the grinding tool while maintaining an uninterrupted eflicient driving connection between the tool and the power plant.

Other purposes will appear from time to time in the course of the specication and claims.

The invention is illustrated more or less diagrammatically in the accompanying drawings wherein:

Fig. 1 is an end View of the tra-ck grinder, with parts in vertical transverse section;

Fig. 2 is a plan View;

Fig. 3 is a section on the line 3-A-3 of Fig. 1;

Fig. 4 is a section on an enlarged scale on the lie 4 4 of Fig. 1;

Fig. 5 is a section on a still larger scale on the line 5-5 of Fig. 4;

Fig. 6 is a section on the line 6-6 of Fig. `3;

Fig. 7 is a detail;

Fig. 8 is a section on an enlarged scale on the line 8 8 of Fig. 6;

Fig. 9 is a plan view of the lower' main frame or carriage;

Fig. 10 is a section on the line III-I0 of Fig. 1;

Fig. 11 is a section on the line lI-II of Fig. 5; Fig. 12 is a section on an enlargedscale onthe line I2-I2 of Fig. 3;

Fig. 13 is a section on the line I3-I3 of Fig. 12;

Fig. 14 is a section on an enlarged scale on the line I4-I4 of Fig. 1; Fig. 15 is a partial View similar to Fig. ,1, with parts in diierent position;

Fig. 16 is a section taken substantially on the line I 6-I5 of Fig. 1, with parts broken away,

illustrating the grinding toolin a ydifferent Dosition;

Fig. ll'is a section.v on the line I'I-I'I of Fig. 16; and

CII

Fig. 18`is a section on the 1ine\I8-|8 of Fig. 17.

Like parts are indicated by like symbols throughout the specification and drawings.

Referring t0 the drawings, I, 2 illustrate the rails of a track, mounted on any suitable members, such as the ties 3. Ridingon vthe rails is a main framegenerally indicated as -A and includinga pair of generally parallel transversely extending tubes 4, each of which has superposed above it and secured to it, as by welding, a somewhat smaller tubeA 5. The side frame members thus formed may be connected for example by parallel longitudinally extending members 6, herein shown as square tubing.

l, 8 are transversely extending braces, and tie plates 9 are' employed at the `,corners and center of the frameY thus formed. Connected along each pair of tubes 4, .5 and extending outwardly therefrom is an angle I0, the purpose of which will later appear.

The railengag'ing anged wheel I I ,is herein shown as vrotatably mounted at each end of each of the tubes 4. These wheels 'maybe electrically insulated in any suitable manner irom'theframe A. Located along one of the tubes 4 at one end of the main frame are a plurality of racks I2, I3 and I4.

Mounted for transverse'movement in relation` to the main frameA is the sub-frame or carriage generally indicated 'as 1B and including a pair of frame members shown as square bars I5, I5,

which maybe connected by `any suitable cross.l

bars or cross members I6, I6, of which four are illustrated in Fig; 6. The ends of the cross bars I5 carry blocks I'I, which carry pins I8, associated with` which are channeled wheels I9, formed to fit VJthe upper surfaces of the rods or tubes 5 of the main frame A, as shown for examplein Fig. 8. 'At-one end of thesubfframe B, as shown at the left handjof Fig. 6 andas shown in detail in Fig. 7, is a cross memberZ, having at each end a sleeve 2| which is adapted to slip over theend of one of the'pinsls and to be held in vposition for example by any suitable securing nut or means 22.

lAssociated with and xed in'relation `to the sleeves- 2| are downwardly and inwardly extending securing brackets 23, the lower and inwardly extending flanges 24 of which penetrate beneath the 4angle of the member I0`, "a ndgthere Qre Preventingunintended upwardbodily move- I ment of the end of the sub-frame B. An identical structure is shown also at the opposite end of the sub-frame B, as shown in Fig. 6, but to the member thereof is secured a pair of ears 25, through which pass any suitable pin or bolt ed to an angle member 28, the lower ange of abutment member 29, xed to the angle member q 28. Screw threaded for passage therethrough is a securing screw 30, having any suitable manipulating head 3l. The inner end of the screw 36 abuts against an angle member 32, provided with a sleeve 33, pivoted on a pin. 34 located below thev pin 26 extending into the ears 21. It `will be un- The thrust of the screw 30 sub-frame to be located at any desired point in its movement across the mainframe A and between the rails of the track,

Welded or otherwise secured to'the opposite 26, on which is pivoted ears or lugs 21., connectwhich is provided with a nut or screw threaded I C. Illustrated for example is the shaft 12 and rball bearing assemblies 13. The shaft 68 is supported in the member 69 by upper ball bearing assemblies 14.

` derstood that a clamp is thus provided for clamping a structure in relation to the angle I U, as shown in Fig. 8. i urges the upper flange ofthe angle 32 against the lower face of the outwardly extending flange of the angle IIJ and locks it against the upper arm of the angle 28. This structure permits the outer sidesof the members I5 are square tubing extensions 35, 36. Extending outwardly from the opposite sides of the Ytwo inner members I6 are similar square tubing extensionsA 31, the purpose of which will later appear.

Mounted within the two inner members I6 and i the side members l5, as shown in Fig.' 3 and Fig.

6, is a circumferential ring 38, which forms part of the ball race, being channeled at 39 to'receive balls 40, the opposite sides of which penetrate a q corresponding channel 4l in a central ring 42 having an upper iiange 43. Mounted upon and secured to this upper flangeA 43 is the upper frame i assembly generally indicated as C and shown for example in Fig. 3. The balls may be admitvted, to the space between the rings 39 and 42 through an aperture 44, which may beclosed by any suitable plug or closure 45.

The upper frame C is shown'as including four 46,

nected by transversely extending handlebars or tubes 49, which may be connected in any suitable manner, as by straps and have connecting end pieces 5I at each end thereof. Additional cross bars 52 are also shown in Fig '.3 adjacent but not at the mid points of the bars 49. AS

shown for example in Figs. 2 and 3, a grinder `arm guide structure is employed, having a pair `of vertically extending guide members 53, supported at top and bottom, as shownin Fig. 1, by

:outwardly extending bottom supports 54'and outwardly extending top supports 55, which are welded to the frame assembly C. Pivoted at or above the members 55 is a sheave 56, about which `passes any suitablesupporting cable 51, the lower `end of which'ends in a supporting fork or conlnection 58', associated with the grinder arm structure later described. The upper end ofthe `cable 51 terminates in a securing member V59, to `which is secured the coil spring 60 housed within Pivoted on the shaft 68 is the grinder arm 15, on which are the ball bearing assemblies 16. Mounted for rotation on the outer end of the arm 15 is the grinder shaft 11, mounted in ball bearing assemblies 18 and carrying a pulley 19, about which pass the belts 8D, the opposite ends of which pass around a portion of the pulleys 61 above referred to. Thus an articulated drive is provided for the grinder shaft 11 fromv the motor.

It will be observed that the shaft 12 is concentric with the drive shaft 64 of the motor 63, as, shown for example in Fig. 4. The shaftl 11 is mounted in a head assembly-8| which may be mounted for rotation in relation to the arm 15. The arm 15 is illustrated as tubular, and the' assembly 8l as having Aa telescoping portion 8'2 penetrating the outer end of said tube.

Any suitable grinding members` may be secured on the shaft 11 at either end thereof. Illustrated in Fig. 4 are a simple slotting disc 83 at one end of the shaft, .and -a multiple grinding disc 8545ev ber 92 may be provided, as at 95.

understood, o-f course,`that the grinding members are replaceable and removable, and any suitable securing means maybe 'employed therefor.

Guards may be employed for the wheels, as indicatedatl and y'66. The guard y86 is illustrated as remova-bly mounted. 81, 88' indicate am7 suitable handles mounted on or integral with the assembly 81 for controlling the position of the grinding 4head and the grinding tool. In order to control the rotation' of the assembly 8| in relation to thel tube 15, locking' means are provided, including the lug 89, upon which is mounted a. segment Sil having aiplurality of' adjustment slots 9| at the outer arcuate surface'thereof. These slots are adapted selectively to receive' a locking member 92, 'having a slotv penetrating reduced portion 93, `the member 92 being pivoted to the.' arm 15, as at 94. Anysuitable lateral guides andconning means forr the pivoted mein- The arm A15 isl guided between vertical frame. members 53 on the frame C, connected at their. lower and upper ends, respectively, to the members. 54 and 55. These arms are provided with. apertures 54a and 54h, through-which an radjusting pin 54e may pass. The pin is adapted for engagement with. the rack 15awhen the arm isA in ther position in which it is shown in Fig. l. It serves then tofhold it in an adjusted downwardposition. Or the arm 15 canbe'moved to the position. in which it.y is shown. in Fig. 15, in which case it may beheld inoperative by the pin 54e,` which penetrates an apertured lug 15b on the arm 1.5. 1t will be understood that the spring 68, through the tension member 51 and the securing fork 58, tend's to rotate the arm 15 to an elevated position. Thel effect of thesp-rl'ng maybe varied in any 'suitable' manner either by adu'sting thefabutment 62 of the spring, or, as shown in-Fig.1,

l by adjusting the connection. between the tension member 51 and the member 58, a' screw threaded adjusting connection beinlgl shown as flat 51m. It will lbe understood that the pin 54h may be held in inoperative position,` and in manyv of the operations of the grinder it is not employed at all. It is effective, for example,in'holding the grinding mechanism in a ilxed position when operating on the side of a rail and-whenno vertical movement of the grinder is desired.

The sub-frame C may be locked in any one of four positions about its axis of rotation, indicated for example at X inFig. 6.' Mounted on the bottom `frame -members 46 is a pivoted locking member generally indicated as 96, shown as pivoted, as at 91, in Fig.` 12, and is provided with a downwardly extending portion 98 `adaptedrto penetrate between the mem-bers 35 and 35, a's shown at two points in Fig. 6,' or between the members l5' and 31, also as shown in Fig 6, these locking areas beingindicated as a, b; c and d in Fig. 6. The locking member may be swung up into inoperative position, as shown in dotted line in Fig. 12, which permits unimpeded rotation of the sub-frame C andthe parts carried thereon. 99 indicates any suitable flange or abutment which may'if desired be used as a hand piece, and also as a limiting stop for limiting' the downward movement, as shown in Fig. 12.`

The arm 69 is also provided ywith gui-ding means, including a projection |00, shown for example in Figs. 3 and l5, which travels in a guiding channeled structure, including the spaced members |l. The guiding member may be adjusted, for example, by any suitable set screw' or adjusting member |02, and may be bolted inposition, as by any securing boltY or `securing means |03, which hold it against the members 52.-I

Mounted on the longitudinal frame member 6 of the mainv franfe A are additional guiding means for the outer end of the arm'15. As shown for example in Fig. 9, an abutment member |04 is illustrated which is contained between xed positioning members |05 on the frame member 6 and removably locked in position, as by any suitable screw |36, on an arm |04a integral with the member |04. The member |04 carries a pair of uprights |61, adapted toreceive between them the Y arm 15, as shown for example in Fig. 10. vWhen the members |01 are in position, .they permit an up and down movement o1" the arm 15, While preventing any lateral deflection. The abutment member |64 is provided 'with lugs |04b to engage the upper and lower faces of the frame members 6. It will be noted that both frame members 6 are provided with xed positioning members |05. Two of such abutment members |04 may be employed as shown in Fig. 1.

Under some circumstances it is advantageous, for example when grinding the inside of the rail, to advance the grinding mechanism as a whole slowly along the rail, and to control its movement precisely along the rail, and lock it in position where necessary. In order to permit such precise and relatively slow movement of the mechanism as a whole along the track, `a manually loperable control member or clamp is provided, including a handle portion |20, a Ytrans'- verse frame member |2|, and inwardly extending forks |22, |23. These forks are provided'fwith Wedge-like wheel engaging members 'or portions |24. |25 is a lug or offset inwardly extending from the top of the member |2 midway between the forks |22, |23. The fork may be employed as' a locking means by pushing Idown on the handle |20, which tilts the forks |22, |23,and

against movement along vthe track, which-is ef.- fected yby the member 12m/which can be' oontrolled by the operator with one hand While with the other hand he manipulates the grinder unit. The handle |20 and the forks can also be used as a means for moving the frame longitudinally -along the track, which is advantageous where relatively short and -closely controlled longitudinal `movement of the grinder is desired. l 15 For example, as shown in Fig. 16, when the grinder grinding whee184 is engaging the inner facefof the rail, it is advantageous to obtain an automatic thrust or a. spring controlled thrust fof the grinding element against the rail. When this with the rack 15a. `It will be understood,` however, that when the parts 'are in the position of Fig. 1, this particular locking means may'not be employed, as in rail slotting or grinding off the j ends of the rails the outer endy of the arm 'I5 is' raised and lowered or is moved transversely across the top'of the rail, or both. However, when the vparts are in the position of Fig. 16, the particular locking means above discussed are employed to` holdthe lower 'end of the arm 15 in such position that the grindingy element 84 engages the`inner face of a rail.

Whether the end of the arm 15 is held down in the above fashion, or whether it is manually held down, it is advantageous to provide a spring thrust of the grinder against the side of the rail, and this is provided by the employment of a spring |30, associated with an adjusting chain |3 The spring |30 is shown as secured to a rod |32`, telescoped in a guiding sleeve |33 onthe turntable or frame assembly C. The adjusting chain portion of the spring assembly may be hooked into or secured yto a link |34 on thefram'e assembly B, as shown in Figs. 3, 6 and 16. Theeffect of the spring is to rotate the turntable structure in such direction as to exert a thrust of the grinding member 84 againstthe inner face of Vthe rail. If the arm 15 is at that time locked in downward position, all that the user has to do is to move the main frame as a whole 'along the rail.

While the parts are illustrated in side grinding position in Fig. 16, and the locking member |2| is also illustrated in position, it will be understood that this is merely for convenience in illustration, as it may not be desirable to use the locking means in connection with side grinding, or it may.

be desirable to use the locking means in connection with other operations. that when the parts are inthe position of Fig. 16

for grinding the inside of the rail, the turntable is not locked in relation `to the sub-frame B, but is free to turn as far as the engagement ofthe grinding 4member with the rail will permit under the yiemmg urge of the spring Isn. It 'win be understood that,` when grinding a frog 'or vswitch point, the relationship shown in Fig. 1 6 `may be reversed so that the spring |30 maybe connected It will be realized that, whereas a practical and n l operative device is described and illustrated, nevertheless many changeslmay be made in the size,

raises the wedge portions |24 into locking engage- -ment with. the flange of the supporting` Wheel.` VMeanwhile the intermediater portions, `of the members |22, |23 engage-the top'of the rail, and

the result is a locking of the whole assembly` It willbe understood tilted' to grind down rail ends or-rail sides.

-shape,;number and disposition of lparts lwithout departing from the spirit of the invention. It is therefore wished that the descriptionv and drawings betaken as in abroad sense illustrative ,or

diagrammatic, rather than asa limitationtothe precise showing.

.-f-,The use and operation ofthe invention are .as

In general three mainassemblies are .provided namely, the main frame A, which rides onthe rails and moves longitudinally along the rails, the sub-frame B, Which rides on the main frame and moves transversely across the track, and the turntable assembly C, which is mounted for rotation about ya 'Vertical axis onl the subframe-B. Ihe

turntable may be locked at a choice oil-four' posi- ,tionsonthe sub-frame,v these positions beingsepyarated Aby 90 arcs. The arm 'lli` may be locked in-j,predetermined'position, las, wlen doing the grinding shown in Fig. v16; or it may-befreely `rguided for vertical and transverse `mover-nent,jas

by vthe verticals-y IUT. Or itr can be locked in and tops ofthe rails.

the: rail during grinding. It may be used to slot rails,v orto grind olf ,the ends of rails. It may be What is claimed is: y 1.l In a rail grinder, a main frame,means-for movably supporting it on the rails of atrack, a sub-frame, means for movably supporting it on` the mai-n frame for :movement transversely-ofA the track, a turntable von the sub-frame, anarm Yonsaidturntable mo-unted for .oscillation in a generallyvertical plane, :a-grin'ding member on A,said arm, means for rotating it, -andmean-s-.for supporting the inner end of said arm, including a pivoted link upwardly extending fromthe turnl table, the inner end of the arm being pivotedto .the upper end of the link. a 1 i 2..In a rail grinder, a main frame,lmeans for movably supporting it -on the railsA of a track, a sub-frame, means for movably supporting it on .the mainframe for movement transversely ofthe track, a turntableon the sub-frame, anA arm on -said turntable mounted for oscillation -in4 a genervally vertical plane meansl for supporting its inner end ,including a pivoted link the lower-fend :of

. which is pivoted to the turntable, a grinding l, imember on said arm, and means for rotatingsaid grindingv member, including a power plant on the '.turntable,` having a drive shaft A and a drivepul- .1ey,a rdriven pulleygenerally coaxial withi'the =connection between the upper endof thevpivoted f link and the inner end of ,the arm, exible, drivl; ing. connections passing about saidpulley and the i ydrivepulley, an ,additional driven pulley Vassociatedwith they grinding member,vr and an additional exible driving connection extending about said rstmentioned driven pulley and said last mentioned driven pulley. j

` 3. ,Inf a rail grinder,A a main frame, `means Ifor movably supporting it on the` rails. of a track,..a subframe, means for` movably supportingit'on i l. 1 l 2,364,879

.the main framefor movement-l transversely ofthe -track, a turntable on the sub-frame, an arm on y v:said turntablemounted for oscillation -in a generally vertical. planegaY grinding member on said arm, andmeans-for rotatingit, and means for supportingtheinner end-of said arm, including ,a pivoted link upwardly; extendingfrom the turntable, the .innerend'of the arm beingpivoted to kthe'ulpper endA of theflink, and means for lockingsaidarm inrelation to said turntable and for thereby preventing its oscillation.

.4. In a rail grinder,ia ,main frame, means for supporting the inner end of said arm, includingk alpivoted link kupwardly extending from the turntable,the inner end of thev arm being pivoted to the upper end of thev link, and guiding means for permitting oscillation of said arm and link vwhile,tpreventing their lateral displacement from their normal plane-of oscillation. l

5. In a rail grinder, a mainframe, means for movably supporting it'on the rails of a. track, a

lsub-frame, means for movably supporting it lon the. main frame'for movement transversely of the track, a turntable on the sub-frame, an arm on saidy turntable mounted fory oscillation in a generally vertical plane, a grinding member on said arm, a grinder head Aupon which said grinding member is journaledsaid grinder head being mounted for rotation in relation to said arm about an axis generally fparallelvvith thelong extension of said arm, and means for adjustably securing Asaid head against such rotation.

6. In a rail grinder, a main frame, means 'for movably supporting it on the rails of a track, a sub-frame, means for movably supporting it on the main frame for movement transversely ofthe track, a turntable on .the sub-frame, an yarm on said turntable mounted for oscillation in agena erally vertical plane, a grinding member on said arma grinder head upon which saidv grinding vmember is journaled, said grinder vhead being mounted for rotation .in relation tosaid armabout an .axis generally parallel with the long extension ,of said arm, and means for adjustably securing said head against such rotation, `including a notched segment and va pivoted detent adapted selectivelyto penetrate the notches of said seg# ment.

7. In a rail grinder, a'main frame, means for movably supporting it on thevrails of a track, a

sub-frame, means for movably supporting it on the mainv frame for movement transversely of the track, a-turntable on the sub-framean arm on saidvturntable mounted for oscillation inA a generally vertical plane, a grinding mem-beren said arm, and means for rotating it, and meansfor yieldingly urging said turntable torotation ina predetermined direction and for therebyurging the grinding member againstthe side of a rail of said track. y f

1 8. Ina rail grinder, a main frame, means'for movably supporting i-t onthe rails of a track, a

sub-frame, means for movably supporting it on the mainframe for vmovementtransversely ,of the track,.a turntable'on thesub-,frama an arm on said turntable mounted foroscillation in a generally vertical :jplane,.aj ,grinding vmember onisaid arm, and means for rotating it, and means for yieldingly urging said turntable torotation in a predetermined direction and for lthereby urging the grinding memberagainst the side of a raill of said track, including a coil spring, means for securing one end of said spring to the turntable, and means for,securing the other end of said spring to the sub-frame.

9. In arail grinder structure, a grinder arm .mounted for oscillation in a generally vertical plane, vertical guides adapted to permit such oscillation while rpreventing lateral displacement of the arm from its plane of oscillation, and means interposed between said vertical guides and said arm for locking said arm against such vertical oscillation, including a pin removably positioned on, and extending between said guides.

l1. In a rail grinder structure, a grinder arm mounted for oscillation in a generally vertical plane, vertical guides adapted to permit such oscillation while preventing lateral displacement of the arm from its plane of oscillation, and means interposed Ibetween said vertical guides and said arm for locking said arm against such vertical oscillation, including a pin removably positioned' on,' and extending between said guides, and a rack, on said arm, opposed to said pin. Y

12. In a rail grinder, a main frame, means for movably supporting it on the rails of a track, a sub-frame, means for movably supporting it on the main frame for movement transversely of the track, an arm on said sub-frame mounted for oscillation in a generally vertical plane, a grinding member on said arm,- means for rotating it, and means for supporting the inner 'end of said arm, including a pivoted link upwardly extending from the sub-frame, the inner end of the arm being pivoted to the upper end of the link, the means for rotating the grinding member including a power plant on the sub-frame, having a drive shaft and a drive pulley, a driven pulley generally 14. In a rail grindena main frame adapted to span the rails of a track, Ameans for movably sup? porting the frame .on thetrack, a sub-frame transversely movable on themain frame, alturntable on the sub-frame, .an arm on the turntable mounted for oscillationabout a ygenerally horizontal pivot, a grinding member on said arm,

and means for rotating it, means for locking the` sub-frame, with the turntable located selectively midway between the railsoradjacent either of the rails, and means for selectively lockingthe turntable with the arm generally parallel with the rail when the sub-frame is located .adjacent a rail, and with the arm generally perpendicular to the vertical planesof the rails when the sub-` frame is located intermediate the rails.

15. In a rail grinder, a main frame and means for movably supporting it.on .the rails of a track,

a sub-frame mounted on `the mainframe for movement transversely of thev track, a turntable on the sub-frame, an arm, Kand an intermediate.

connection between the arm and the turntable incoaxial with the connection between the upper end of the pivoted link and the inner end of the arm, flexible driving connections passing about said pulley and the drive pulley, an additional driven pulley associated with the grinding member, and an additional iiexible driving connection extending about said first mentioned driven pulley and said last mentioned driven pulley.

13. In a rail grinder, a main frame adapted to span the rails of a track, means for movably supporting the frame on the track, a sub-frame transversely movable on the main frame, a turntable on the sub-frame, an arm on the turntable mounted for oscillation about a generally horizontal'pivot and for endwise movement in a gencluding a member movably mounted on the turntable, the inner end of the arm being rotatably mounted on said member for rotation about` a generally horizontal axis, a grinding A,member mounted on an outer portion .of the arrnfor -rotation about a generally horizontal' axis yand means for rotating it.y y ,y

16. In a rail grinder, a main frame and Vmeans forV movably supporting it on the rails of a track, a sub-frame mounted o n the main frame for movement transversely of the track,a turntable on the sub-frame, kan arm, and*V an intermediate connection between the rarm and the turntable including`a member movably mounted on the turntable, the inner end of the arml being rotatably mounted on saidmember: for rotation about a generally horizontal axis, a grinding member mounted on an outer portionof the arm for ro-v tation about a generally horizontal axis and means forrotating it, selective means for locking the turntable; in relation to the sub-frame with the plane of movement jof the armjparallel with the track rails and withthe plane of movement r mounted on said member for rotation about a generally horizontal axis, a grindingfmember mounted on an outer portion of the armfor rotation about a generally horizontal axis and means for rotating it, and means for locking rthe subframe selectively in an intermediate position beerally vertical plane, a grinding member on said vertical planes of the rails when the sub-frame is located intermediate the rails.

on the turntable, the inner end of the arm being rotatably mounted von said member fory rotation tween the two rails of the trackor adjacent eitherrail of the track. f v j 1S. In a rail grinder, a main frame and means for movably supporting it on` the rails of a track, a sub-frame mounted on the main-frame for movement transversely ofthe track, a turntable onthe sub-frame, an arm, and an intergmediate connection between the arm andthe turntable including a .member movably mounted about a generally horizontal axis,r a grinding member mounted on an outer portion ofthe arm for rotation about a generally horizontal axis' andj means forrotating it', andjmeansIOF'yieIdingly supporting said arm'l Whilei permitting 3in1- tended Vdovvnvvar:lfmanual movement; of 'the' outer endof'thearm. j ,y y

19.*` Ina rail grinder, a vmain frame and' means for movably supportingiton'the rails' of atrack,

turntable, a1'1clv Varcoill spring extending between saidsupport andan'intermediate portion of the 20.111-y a rail grinder, aA main frame, means for moi/ably supportingit'on'therails of atrack, a sub-frame, means" for" movably; supporting it on themain" frame'l Afor movement transversely of thei track, an arml on said" sub-frame, means for mounting it both forverticaloscillation'and for transverse movement, in relationjto saidl sub# y frame, in a generally vertical plane-generally at rightl anglesv :to the rails' of: the track includingv a connecting;memberto-vvljiicli` the' inner end' ofthe arm isr pivotedA for 'rotation about* a gen# erally'horizontal'axis and means for movably securing 'said connecting member upon said sub-v frame, anda Ygrinding member onsaid arm, and; means for'rotatingl it.. n y

21. Inra rail grinder; amain frame; means r4for movably supporting it on the rails of'a track', a sub-frame, means 'for movably supporting it;

lframe, in a generally vertical: plane including av connecting member lto which the inner end'of thev armis pivoted for' rotation about a generally.

horizontal axis and means for movably secur-v ing said connecting member luponsaid sub-frame;

anda grindingmember `on'said arm, .and 'means for rotating it.

` 24:.V In a rail grinder, a main frame, means for movably supporting it on the rails of attack, a s'ubeframe, means for' movably `supporting it on the main frame for movement transversely of the track, an 'arm on said subframemeansifor mounting it both vfor vertical oscillation l and for transverse movement, in relationto saidsub# frame, in la generally vertical plane including a connecting `member to which the innervendof the :arm is pivoted for rotation .about a generally horizontal axis and means-for'movably. se-

curingA saidv connecting member uponsaid subframe, `and a grinding member on said arm, and meansy for rotating it, land meansI forselectively positioning said arm for' movementA in a plane on'. thez main l frame for' movement transversely of tlietrack,` means' for' locking said sub-frame;

selectively 'in an'intermediate position` between th'e'rails of the track, and adjacent theirrails, a]

turntable-on saidv subeframe; an arm onf said turntable, means for mounting it bothA @for vertical oscillation and for' transverse movement-in relation to saidsub-frame', in ai generally `vertical plane,v including aconnecting Ymember to Whichthe inner end of f' the-arm'is fpivoted for rotation about a'V generally'horizontalaxis and` generally at right angles to the rails-of the track and for movement in a plane generally parallel with the rails of the. track.

25 .In a railY grinder, a; main frame and means t formovably supportingit on the railsof a track,

la sub-frame mounted on the. mainframe for movement transversely of the track, an arm-.rotatablymountedlin relation to the subframea e 'grindingmember mounted on the arm for rotay tionabout a generallyl horizontal axis, and means for rotatingv it, guiding means for normallycom nning the movement of said arm to a generally Verticalplane and. means for movably securing said arm, to said sub-frame'including an intermeansl for movably securing said connecting;

member upon said turntable,V and" a grinding;

member on said arm, and means-for rotating it.

e 2'2. In arailgrinder, amain frame, means-for movably supporting it on `the rails offa track, a

sub-frame, means for movably' supportingjit'on the 'main-frame for movement transversely of theA track, means for lockingsaidsub-frame,

selectively in `*an intermediateposition between therails of the track, land'adjacent their rails,`

a turntable on saidisub-frame, an' arm on"'s'aid turntable,means for mounting itboth' for vverftical oscillation and for ktransverse movement i in relation to said sub-frame,` in a generally ver-i tioal'plane, including a connecting member to ywhich the .innerend ofthe arm is pivoted for rotation about a generally horizontal axis and means for movably securing saidconnecting member upon said turntable, and a grinding t. member on .said"arm, rand"meansfor rotating it,

andj means forselectivelyl locking said turntable in position withV the plane of movement of the i arm 'either parallelwithv the rails or generally perpendicularto therail's.

mediate oscillatable connecting elementbetween said arm and'said sub-frame upon Whichsaid arm is mounted for rotation about a generally horizontall axis, Vsaid connecting element b-eing oscillatably/ mounted in' relation to said subframe wherebyl saidarm is.' mounted for ready endwise movement yduring its rotation in its vertical plane. t. l

26. In a rail grinder, a main frame,v and means for movably supporting iton the rails of a track,

and means for locking it against -movementzin relation tothe track, a sub-frame mounted on the main frame for movement Atransversely, of

lthe track, a turntable on the4 sub-frame, an arm,

and an intermediate connectionvbetween the arm and' the turntable including' a memberr movably mounted on the turntable, the inner end'of the arm being rotatably mounted on said member for rotation aboutI a generally horizontal axis,v a grinding-member mounted on an outer portion of' the arm for rotation about a'. generallyfhorizontal axis andr means forcrotatingit;

, 27. In a rail grinder, a frame, means for movf ably supportingl it'on the rails of fa' track, an arm on saidxframe mounted for os'cillation'in a generally vertical-plane, a grinding member on saidarm, means for rotating it' and lmeans 'for supporting'tlie inner end of,y said arm including a pivoted link upwardly extending from the frame, the `inner end of'the -arm being pivoted toy the Yupper end of the link, the means for ro; tating the grinding' member including a"` power plant on the frame having a drive shaft and a drive pulley, a driven pulley generally coaxial with the connection between the upper end of the pivoted link and the inner end of the arm, flexible driving connections passing about said pulley and the drive pulley, an additional driven pulley associatedwith the grinding member and an additional flexible driving connection extending about said rst mentioned driven pulley and said last mentioned driven pulley.

28. In a rail grinder, a frame, means for movably supporting it on the rails of a track, an arm on said frame mounted for oscillation in a generally vertical plane, a grinding member on 'said arm, means for rotating it and lmeans for supporting the inner end of said arm including a pivoted link upwardly extending from the frame,

the inner end of the arm being pivoted to the lupper end of the link, the means forrotatlng thetional flexible driving connection extending about said first mentioned driven pulley and said last mentioneddriven pulley, and a turntable struc f g ture on the frame, on which said power .plant `15 and arm are mounted. 

